Mining machine



Nav. 1o, 1936.

MINING MACHINE Nov. 10, 1936. A F. A. LINDGREN MINING MACHINE original Filed March 1s, '1931 4 Sheets-Sheet 2 NovilO, 1936. F. A. LINDGREN q2,060,226

MINING MACHINE original Filed Maron 15, 1951 4 sheets-sheet 5 Patented Nov. 10, 1936 UNITED STATES PATENT OFFICE MINING MACHINE Application March 13, 1931, Serial No. 522,236 Renewed `lanuary 10, 1935 21 Claims.

This invention relates to improvements in mining machines and more particularly to mining machines of the shearing type adapted to cut' a vertical kerf in a mine wall at various angles with respect thereto including a vertical kerf at right angles to the mine track.

My invention has among other objects to provide a new and improved mining machine of the shearing type of a low compact design havl ing a pivotally mounted cutter bar movable about a horizontal axis and movable on guides into and out of the coal and having frictionally controlled plural speed drive means for feeding the cutter bar into the coal and retracting said cutter bar l therefrom, and for'vertically moving the cutter bar in the coal about a transverse axis.

Other objects of my invention will appear from time to time as this specification proceeds.

My invention may be more clearly understood with reference to the accompanying drawings wherein:

Figure 1 is a side elevation of one embodiment of my invention in position to make a vertical Cut in the mine wall parallel with the mine track;

Figure 2 is a side elevation of the device shown in Figure 1 in position to make a vertical cut in the mine wall lat right angles to the mine track;

Figure 3 is a partial fragmentary plan view of the device shown in Figure 1 with parts broken away and in section to more clearly show the details of my invention;

Figure 4 is a partial fragmentary side elevation of the device shown in Figure 1 with parts broken away and in section to more clearly show the details of jmy invention;

Figure 5 is a partial sectional view taken on line 5-5 of Figure 3;

Figure 6 is an enlarged partial longitudinal section taken on line 6--6 of Figure 3; and

Figure 7 is an enlarged detail sectional view showing a detail of the means for holding the holding jacks to the machine frame.

Like numerals refer to like parts throughout the various gures.

Referring now in particular to the embodiment oi my invention illustrated in the drawings, I0 indicates a truck supported on track wheels II and axles I2. The truck IB is provided with a vertical bearing I3 midway between the truck axles I2 on the longitudinal center line of said truck for receiving a bearing member I4 depending from and attached to a turntable I5.

The turntable I5 has a pair of vertically disposed parallel spaced guide bars Il fixed to the top portion thereof in a suitable manner; as, for

instance, angle irons and rivets as is illustrated in Figure 5. The parallel spaced guide bars I'I extend forwardly and rearwardly of the turntable I5 'and extend forwardly beyond the truck I0 to provide a slidable support for a cutting 5 element I8.

The Acutting element I8 includes a vertically disposed cutter bar I9 pivotally supported thereon for movement about a horizontal axis adjacent its rearward end and a motor 20 for mov- 10 ing said cutting element along the parallel spaced bars I1, for vertically moving the cutter bar about its horizontal axis and for driving a cutter chain 2| about said cutter bar in a usual manner. 'Ihe motor 20 may be of any type well 15 known to the art but is herein preferably shown as being an electric motor.

'I'he cutting element I 8 is supported on the parallel spaced guide bars I'l for reciprocable sliding movement therealong. Said guide bars have a 20 relatively wide top surface to provide a firm slidable support for said cutting element and are relatively wide to accommodate guide members 23.

The cutting element I8 includes a frame mem- 25 ber 25. The guide members 23 are fixed to the frame member 25 adjacent opposite ends thereof and extend outwardly from each side thereof. The guide members 23 ymay be xed to the frame member 25 in any suitable manner but are here- 30 in preferably shown as being bolted to said frame member. These guide members have bearing support on the top surface of the parallel spaced guide bars I'I and extend downwardly along the outer side of said guide bars and are provided with 35 inwardly extending projections 26 which engage a portion of the under surface of said guide bars to prevent tilting movement of the cutting element I8 with respect to the turntable I5.

A horizontal rack 21 extends inwardly from 40 each guide bar I1. This rack is of an ordinary construction well known to those skilled in the art so will not be described in detail and is engaged by sprockets 29 on opposite sides of the cutting element I8 keyed to opposite ends of a 45 horizontal shaft 30. The horizontal shaft 30 is journaled in the frame member 25 and may be selectively driven by the motor 20 in reverse directions without reversal of said motor at a plurality of predetermined frictionally controlled 50 speeds in a manner which will hereinafter be described.

The cutter bar I9 is mounted on a support member 3i for pivotal movement about a transverse axis. The support member 3I is provided 55 with a hub 32 at one side, which hub is freely mounted on a horizontally disposed sleeve 33 and the outer surface of said hub is journaled in a bearing member 35 xed to the frame member 25. The support member 3| encloses a cutter chain drive sprocket 36 keyed on the horizontally disposed sleeve 33 and has a side opposite the side journaled in the bearing member 35 keyed on a spider 31. Said spider is freely mounted on the horizontally disposed sleeve 33 adjacent the opposite side of the cutter chain drive sprocket 36 from the hub 32. The outer portion of said support adjacent said spider is journaled in a bearing support 38 so said support member and the cutter bar |9 may be moved about the axis of the cutter chain drive sprocket 36.

Means are provided for vertically moving the cutter bar |9 about the axis of the cutter chain sprocket 36, which means herein comprises a rearwardly facing arcuate rack 39 keyed on an outwardly extending portion 46 of the support member 3|. This arcuate rack is engaged by a spur pinion 4| keyed on the end of a transversely extending shaft 43 journaled within a bearing support 44 on the frame member 25. A worm gear 45 is keyed on the transversely extending shaft 43 and is driven by a worm 41 on a longitudinally extending shaft 48. The shaft 48 has selective connection with the motor 26 and may be driven therefrom at a plurality of frictionally controlled speeds in a manner which will hereinafter be more fully described.

The worm 41 and worm gear 45 are of the selflocking type so the cutter bar |9 may be held in any desired vertical position with respect to the truck I0.

The outwardly extending portion 4D of the support member 3| has slidable engagement with an arcuately shaped upwardly extending guide portion 49 of the frame member 25. A retaining strip 50 is provided on the upwardly extending portion 49 of the frame member 25 to engage a portion 5| of the outwardly extending portion 46 of the support member 3| to prevent lateral movement of the cutter bar I9 and disengagement of the spur pinion 4| with the arcuate rack 39.

The cutter chain drive sprocket 36 is driven from the motor 26 in the following manner:

A motor pinion 53 meshes with and engages an idler gear 54 on a shaft 55 journaled in bearing supports 56 integral with the frame member 25. The idler gear 54 meshes with and drives a spur gear 51 keyed on the outer end of a transversely extending shaft 58 freely mounted within the sleeve 33 and extending outwardly therefrom and having its opposite end journaled in the frame member 25.

Means are provided for selectively connecting the cutter chain sprocket 36 with the spur gear 51 to drive the cutter chain 2| about the cutter bar |9 which means herein comprise a clutch collar 59 feathered on the hub of the spur gear 51 having clutch jaws 66 integral therewith adapted to engage clutch jaws 6| on the sleeve 33. It should be noted that the clutch collar 59 is so mounted on the hub of the spur gear 51 that the clutch jaws 66 extend through said spur gear and engage the jaws 6| on the opposite side of said spur gear from the clutch collar 59. The clutch collar 59 is moved along the hub of the spur gear 51 to engage the clutch jaws 66 with or disengage said clutch jaws from the clutch jaws 6| to selectively drive the cutter chain drive sprocket 36 from the motor 2D by means of a suitable system of levers in a usual manner not herein shown.

Referring now to several of the novel features of my invention and the means for reciprocably moving the cutting element |8 along the parallel spaced guide bars i1 at a plurality of predetermined frictionally controlled speeds without reversal of the motor and to the means for moving the cutter bar about the axis of the cutter chain sprocket 36 at a plurality of predetermined frictionally controlled speeds, a worm 62 is cut integral with the transversely extending shaft 58 and meshes with and drives a worm gear 63 keyed on a sleeve 64, which sleeve is freely mounted on a longitudinally extending shaft 65. A hub 66, of a casing 61 of a planetary gear mechanism 68, is freely mounted on the sleeve 64 and journaled within a portion of a casing and bearing support for the worm 62 and worm gear 63. The sleeve 64 extends within the casing 61 of the planetary gear mechanism 68 and has a sun gear 69 cut integral therewith. The sun gear 69 meshes with planetary pinions 16 mounted on shafts 1| supported at their ends in a cage 12. The planetary pinions 16 mesh with an internal gear 13 keyed to the inner periphery of the casing 61. Planetary pinions 15 are cut integral with the planetary pinions 16 and are adjacent and coaxial with said pinions and mesh with an internal gear 16 freely mounted within the inner periphery of the casing 61.

The internal gear 16 is provided with clutch jaws 11. A clutch sleeve 18 is feathered on the longitudinally extending shaft 65 and is provided with clutch jaws 19 adapted to mesh with the clutch jaws 11 for driving said shaft from the internal gear 16 at a low speed. Similarly the cage 12. has a member 86 keyed thereto which surrounds the shaft 65 and is provided with clutch jaws 8| for driving the shaft 65 at a high fricticnally controlled speed through the cage 12.

Frictional control of the planetary gear reduction mechanism 68 is effected by means of a friction band 83 which siu'rounds the outer periphery of the casing 61. Said friction band is tightened or allowed to loosely engage the casing 61 to vary the point at which the casing will slip within said band by means of a hand wheel 84 threaded on a rod 85. One end of the rod 85 engages one end of the friction band 83 while the hand wheel 84 abuts a lug 86 fixed to the opposite end of said friction band so rotation of said hand wheel in one direction will tighten the friction band on the casing 61 and rotation of said hand wheel in an opposite direction will allow said friction band to loosely engage said casing.

It will thus be seen that when the friction band engages the casing 61 the internal gear 13 is held stationary and the internal gear 16 and cage 12 are rotated at a high rate of speed due to the orbital travel of the planetary pinions 1U about the internal gear 13, while when said friction band loosely engages the casing 61, said internal gear and cage are rotated at a lower rate of speed due to slippage of the internal gear 13 and casing 61 within the friction band B3. It may also be seen that when undue loads or stresses are imposed upon either the internal gear 16 or the cage 12, the casing 61 will slip within the friction band 83 which will slow the speed of rotation of said internal gear or cage and serve as a safety means to prevent breakage of the various parts of the feeding or cutter bar rotating mechanism.

Thus the shaft 65 may be driven at a predetermined frictionally controlled low speed through the internal gear 16, clutch jaws 11 and clutch jaws 19 on the clutch sleeve 18 or at a predetermined frictionally controlled higher speed through the cage 12, clutch jaws 8| and clutch jaws 19 on the clutch sleeve 18. The clutch sleeve is shifted along the shaft 65 to engage the clutch jaws 19 with either the clutch jaws 11 or clutch jaws 8| by means of a clutch yoke 88 and a suitable system of levers in a usual manner (not shown).

A clutch sleeve 89 is feathered on the forward end of the longitudinally extending shaft 65. This clutch sleeve is provided with a fiange 90 at its rearward end, which flange is pro-vided with apertures 9| adapted to engage clutch jaws 92 extending rearwardly from the falce of a spur gear 93 freely mounted on said clutch sleeve and journaled on its hub in a bearing member 94 integral with the frame member 25. Said clutch sleeve is moved along the shaft 65 to engage or disengage the apertures 9| with the clutch jaws 92 by means of a suitable system of levers in a usual manner. The spur gear 93 meshes with and drives a spur gear 95 keyed on the longitudinally extending shaft 48 for driving said shaft and the worm 41 and thus driving the spur pinion 4| and vertically moving the cutter bar about the axis of the cutter chain sprocket 36. Thus the cutter bar may be vertically moved about the axis `of the cutter chain sprocket 36 at either a high or low friotionally controlled speed through the planetary gear reduction mechanism 68.

Referring now in particular to the means for reciprocably moving the cutting element I8 along s' the parallel spaced guide bars I1 at a plurality of predetermined frictionally controlled speeds Without reversal of the motor, a sleeve 91 is keyed to the rearward end of the longitudinally extending shaft 65 and is journaled in the frame member 25. A bevel pinion 98 is cut integral with the rearward end of the sleeve 91 and meshes with and drives oppositely disposed bevel gears 99 and |00. The bevel gears 99 and |00 are journaled on their hubs in a casing I| integral with the frame member 25 and are freely mounted on the transverse shaft 30. A clutch collar |03 is feathered on the horizontal shaft 30 between the bevel gears 99 and |00 and has clutch jaws |04 on opposite sides thereof. These clutch jaws are adapted to engage clutch jaws |05 on the bevel gear 99 or clutch jaws |06 on the bevel gear |00 for driving the shaft 39 in opposite directions without reversal of the motor in an obvious manner. The clutch collar |03 is shifted along the shaft 3D to drive said shaft from either of the bevel gears 99 or |00 in a usual manner not herein shown or described in detail. Thus the cutting element I8 may be moved along parallel spaced guide bars I1 and racks 21 in opposite directions at either a high or low predetermined frictionally controlled speed without reversal of Athe motor.

Means are provided to hold the turntable I5 and parallel spaced guide bars I1 steady during the cutting operation which comprise a plurality of jacks |01 detachably connectible with the outer sides of the guide bars I1 adjacent the forward end thereof and a plurality of jacks |09 detachably connectible with the rearward end of the truck I0 at opposite sides thereof. The jacks |01 and |09 are of a usual type of screw jack well known to those familiar with the art, which may be interposed between the mine roof and mine bottom and tightened against the mine roof and bottom by means of a suitable hand wheel or any other screw operating means. Said jacks |01 or |09 may be connected to the outer sides of the guide bars I1 or truck I0 in any suitable manner but as herein shown these jacks are adapted to pass through sockets I0. Each socket I I0 has a pin I I I extending inwardly therefrom adapted to be placed in a member |08 fixed to each guide bar I1 and opposite sides of the truck I0 so said socket may be pivotally moved with respect to the truck about a horizontal axis to position the jacks at varying angles with respect to the mine bottom. A nut is threaded on the inner end 'of each pin III and abuts the inner side of the member |08 to hold the socket IIO in the member |08. 'Ihe jacks |09 and |01 are held in the sockets I|0 by means of a bolt |I2 threaded through each socket IIO and having a bearing member II3 on its inner end adapted to bear against the jack which may pass through said socket.

The truck I0 is propelled along the mine bottom to move the mining machine from working place to Working place by means of a suitable gear` train which includes a spurl gear II5 driven by the motor pinion 53 and keyed on a transverse shaft |I6 rearwardly of the motor 20. A bevel pinion |I1 is keyed on the opposite end of said transverse shaft and meshes with and drives a bevel gear IIB. The bevel gear I|8 is journaled on its hub in the frame member 25 and has a shaft I I9 keyed thereon. An outer end |20 of the shaft I|9 is of rectangular cross section and is adapted to be engaged by a forked end I2I of a coupling pin |23. The rearward portion of the coupling pin |23 is of a rectangular cross section and is slidably mounted Within the hub of a worm |24 so that-the forked end 4may engage the outer end |20 of the shaft I I9 or be disengaged therefrom in a usual manner well known to those familiar with the art. The worm |24 is journaled within a bearing support and housing |25 and meshes with and drives a worm gear |26 on a transversely extending shaft |21. IThe transverse shaft |21 is journaled in the bearing support and housing |25 and bearing supports |29 fixed to the truck I0 and has sprockets -I30 keyed on opposite ends thereof. The sprockets |30 have connection with the rearward track wheels I by means of suitable chain and sprocket drive |3I. The forward and rearward track wheels II are operatively connected together by means of suitable chain and sprocket drives |32 in the usual manner. Thus the track wheels II may be selectively connected with the motor 20 for driving said track wheels and moving the 'truck I0 and mining machine about the mine from working place to working place.

Referring now in particular to Figures 1 and 2 and the use and operation of the device embodying my invention, it may be seen that in Figure 1 the cutting element is positioned for cutting a vertical kerf parallel to the mine rails. The jacks |01 and |09 are set at opposite sides of the guide bars |1 and the truck I0, respectively, for holding said guide bars and truck in a stationary position. The cutter bar I9 is positioned so the cutter chain bits are adjacent the mine roof. The motor 20 is started and the clutch jaws 60 are engaged with the clutch jaws 6I to drive the cutter chain sprocket 36 and thus drive the cutter chain 2| about the cutter bar I9. The cutting element is then moved forwardly along the guide bars I1 and racks 21 by means of the sprockets 29 at a slow frictionally controlled speed through the planetary reduction gear mechanism 68 and internal gear 16. When the cutter bar has advanced into the coal the desired distance, said cutter baris moved downwardly about the axis of the cutter chain sprocket 3B by means of the rack 39 and spur pinion 4I driven by the motor 2E) through the frictionally controlled planetary gear device 68. When the cutter bits are adjacent the mine bottom, downward movement of the cutter bar I9 is stopped by means of disengaging the apertures 9I from the clutch jaws S2 and the cutter bar I9 and cutting element I8 may be moved rearwardly along the guide bars I'I at a irictionally controlled high or low speed obtained through the planetary gear reduction device 68, cage 12, or internal gear 'I6 and bevel gears 99 or |00 without reversal of the motor 20.

Figure 2 shows the cutter bar I9 in position to :ut a kerf in the mine wall at right angles to the mine track. In order to cut such a kerf the turntable I5 is moved about the axis of the bearing member I4 and the jacks IU'I and |89 are set between the mine roof and bottom and the cutting operation hereinbefore described is followed through. One purpose oi mounting the cutting element I8 on a turntable is to permit the cutting of kerfs at right angles to the mine track or at various angles with respect thereto so a cut may be made along the entry and another cut may be made at various angles with respect to the entry for driving breakthroughs or cross-entries.

It may now be seen that a new and improved mining machine has been provided which is adapted to cut a vertical kerf in the mine wall parallel to the mine track or at various angles with respect thereto and that this cutting element is movable along an extended guide frame at a plurality of predetermined frictionally controlled speeds. It may also be seen that when the cutter bar has been moved into the coal the required distance, that this cutter bar may be moved about a horizontal axis to cut vertically in the coal at a pluralityof predetermined irictionally controlled speeds. Thus ashearing machine has been provided which has means incorporated therewith to compensate for rock or hard spots encountered in the coal, which means is eiective both while the cutter bar is being sumped or driven into the coal and while 'the cutter bar is cutting vertically downwardly or upwardly in the coal. This prevents breakage of the drive parts for the cutter chain or feeding mechanism and eliminates the tendency of the machine to jump out of the coal when hard spots or rock are encountered. It may also be seen that this mechanism is effective at both high and low speeds which permits a variety of frictionally controlled speeds to be used in cutting and permits the machine to either cut slowly where the coal is hard or cut faster where the coal is soft and enables the machine to be readily positioned for cutting or returned to a travelling position on the truck. It may also be seen that this machine is of a low compact design and is so arranged that the cutter bar is rigidly supported adjacent the coal face during the vertical cutting operation.

While I have herein shown and described one form in which my invention may be embodied, it will be understood that the construction and arrangement of the various parts may be altered or changed without departing from the spirit and scope thereof. Furthermore, I do not wish to be construed as limiting myself to the particular form illustrated, excepting as it may be limited in the appended claims.

I claim as my invention:

l. In a mining machine of the class described, a truck mounted on track wheels and axles for movement along a mine track, a cutting element supported on said truck for reciprocable slidable movement with respect thereto comprising a vertically disposed pivotally mounted cutter chain carrying cutter bar, and a single frictionally controlled plural speed gear reduction mechanism having operative connection with said cutter bar and cutting element for moving said cutter bar about its pivotal axis and independently reciprocably moving said cutting element with respect to said truck.

2. In a mining machine of the class described, a truck mounted on track wheels and axles for movement along a mine track, a cutting element supported on said truck for pivotal movement about a vertical axis and for reciprocable slidable movement with respect thereto in a horizontal plane comprising a cutter chain carrying cutter bar mounted for swinging movement about a transverse horizontal axis, and plural speed means for moving said cutter bar about its pivotal axis and reciprocably moving said cutting element with respect to said truck comprising a plural speed planetary gear reduction mechanism.

3. In a mining machine of the class described, a truck mounted on track wheels and axles for movement along a mine track, a cutting element supported on said truck for pivotal movement about a vertical axis and for reciprocable slidable movement with respect thereto in a horizontal plane comprising a cutter chain carrying cutter bar mounted for swinging movement about a transverse horizontal axis, and frictionally controlled plural speed means having a geared connection with said cutter bar and cutting element for moving said cutter bar about its pivotal axis and reciprocably moving said cutting element with respect to said truck comprising a frictionally controlled plural speed planetary gear reduction mechanism.

4. In a mining machine of the class described, a truck mounted on track wheels and axles for movement along a mine track, a cutting element supported on said truck for reciprocable slidable movement with respect thereto comprising a motor, a vertically disposed cutter chain carrying cutter bar mounted for pivotal movement about a horizontal axis disposed adjacent its rearward end, and a single frictionally controlled plural speed means driven by said motor, a geared connection from said plural speed means for moving said cutter bar about said pivotal axis and another geared connection from said plural speed means for independently reciprocably moving said cutting element with respect to said truck without reversal of said motor.

5. In a mining machine of the class described, a truck mounted on track wheels and axles for movement along a mine track, a cutting element supported on said truck for pivotal movement about a vertical axis and for reciprocable slidable movement with respect thereto comprising a motor, a cutter chain carrying cutter bar mounted for swinging movement in a vertical plane about an axis disposed adjacent its rearward end, and a single frictionally controlled plural speed means driven by said motor, a drive connection from said plural speed means to said cutter bar for moving said cutter bar about said pivotal axis and another drive connection from said plural speed means for independently reciprocably moving said cutting element with respect to said truck without reversal of said motor.

6. In a mining machine of the class described, a truck mounted on track wheels and axles for movement along a mine track, a cutting element supported on said truck for pivotal movement about a vertical axis and for reciprocable slidable movement with respect thereto comprising a motor, a cutter chain carrying cutter bar mounted for pivotal movement in a vertical plane about an axis disposed adjacent its rearward end, a single plural speed planetary gear reduction device, a drive connection from said planetary gear reduction device to said cutter bar for movin-g said cutter bar about said pivotal axis and another drive connection from said planetary gear reduction device to said truck for independently reciprocably moving said cutting element with respect to said truck without reversal of said motor.

7. In a mining machine of the class described, a truck mounted on track wheels and axles for movement along a mine track, a cutting element supported on said truck for reciprocable slidable movement with respect thereto comprising a motor, a cutter chain carrying cutter bar mounted for vertical swinging movement about a horizontal axis disposed adjacent its rearward end, and a single frictionally controlled plural speed means driven by said motor for reciprocably moving said cutting element with respect to said truck without reversal of said motor and moving said cutter bar about its axis of pivotal connection to said truck comprising a frictionally controlled plural speed planetary gear reduction mechanism.

8. In a mining machine of the class described, a truck mounted on track wheels and axles for movement along a mine track, a turntable mounted on said truck, a frame member mounted on said turntable and extending beyond the extremities thereof, a cutting element supported on said frame member for movement therealong comprising a motor, a vertically disposed chain carrying cutter bar mounted for pivotal movement about a horizontal axis, and a single fricticnally controlled plural speed gear reduction device driven by said motor for moving said cutter bar about said horizontal axis or reciprocably moving said cutting element along said frame member.

9. In a mining machine of the class described, a truck mounted on track Wheels and axles for movement along a mine track, a turntable mounted on said truck, a frame member mounted on said turntable and extending beyond the extremities thereof, a cutting element supported on said frame member for movement therealong comprising a motor, a chain carrying cutter bar mounted for pivotal movement about an axis disposed adjacent its rearward end and perpendicular to its cutting plane and plural speed means for moving 'said cutter bar about said pivotal axis or reciprocably moving said cutting element with respect to said truck comprising a single plural speed planetary gear reduction mechanism.

10. In a mining machine of the class described, a truck mounted on track wheels and axles for movement along a mine track, a turntable mounted on said truck, a frame member mounted on said turntable and extending beyond the extremities thereof, a cutting element supported on said frame member for movement therealong comprising a motor, a chain carrying cutter bar mounted for pivotal movement about an axis disposed adjacent its rearward end and perpendicular to Vits cutting plane, and frictionally controlled plural speed means driven by said motor for moving said cutter bar about said axis or reciprccably moving said cutting element along said frame member comprising a frictionally controlled plural speed planetaryl gear reduction mechanism.

l1. In a mining machine of the vclass described, a truck mounted on track wheels and axles for movement along a mine track, a turntable mounted on said truck, a frame member mounted on said turntable and extending beyond the extremities thereof, a cutting element supported on said frame member for movement therealong comprising a motor, a vertically disposed chain carrying cutter bar mounted for pivotal movement about a horizontal axis and frictionally controlled plural speed means driven by said motor for reciprocably movin-g said cutting element along said frame member without reversal of said motol and independently moving said cutter bar about said horizontal axis comprising a single frictionally controlled plural speed planetary gear reduction mechanism.

12. In a mining machine of the class described, a truck mounted on track wheels and axles for movement along a mine track, a turntable mounted on said truck, a frame member mounted on said turntable and extending beyond the extremities thereof, a cutting element supported on said frame member for movement therealong comprising a motor, a vertically disposed chain carrying cutter bar mounted for pivotal movement about a horizontal axis, and plural speed means for moving said cutter bar about said pivotal axis comprising a plural speed planetary gear reduction mechanism and means driven from said plural speed planetary gear reduction mechanism for reciprocably moving said cutting element with respect to said truck comprising reversing mechamsm.

13. In a mining machine of the class described, a truck mounted on track wheels and axles for movement along a mine track, a turntable mounted on said truck, a frame member mounted on said turntable and extending beyond the extremities thereof, a cutting element supported on said frame member for movement therealong comprising a motor, a vertically disposed chain carrying cutter bar mounted for pivotal movement about a horizontal axis, frictionally controlled plural speed means driven by said motor and having a geared connection with said cutter bar and cutting element for moving said cutter bar about said horizontal axis and independently reciprocably moving said cutting element along said frame member without reversal of said motor Comprising a single frictionally controlled plural speed planetary gear reduction mechanism and reversing mechanism interposed between said planetary gear reduction mechanism and the drive means for reciprocably moving said cutting element along said frame member.

14. In a mining machine of the class described, a truck mounted on track wheels and axles for movement along a mine track, a turntable mounted on said truck, a frame member mounted on said turntable and extending beyond the extremities thereof,A a cutting element supported on said frame member for movement therealong comprising a, motor, a vertically disposed chain carrying cutter bar mounted for pivotal movement moving said cutter bar about said pivotal axis or reciprocably moving said cutting element with respect to said truck including a single plural speed planetary gear reduction mechanism and selflocking means for holding said cutter bar in various angular positions with respect to said frame member.

15. In a mining machine of the class described, a truck mounted on track wheels and axles for movement along a mine track, a turntable mounted on said truck, a frame member mounted on said turntable and extending beyond the extremities thereof, a cutting element supported on said frame member for movement therealong comprising a motor, a vertically disposed chain carrying cutter bar mounted for pivotal movement about a horizontal axis, frictionally controlled plural speed means driven by said motor for moving said cutter bar about said horizontal axis and independently reciprocably moving said cutting element along said frame member without reversal of said motor comprising a single frictionally controlled plural speed planetary gear reduction mechanism, reversing mechanism interposed between said planetary gear mechanism and the drive means for reciprocably moving said cutting element along said frame member, and self-locking drive gearing for moving said cutter bar about said pivotal axis or holding said cutter bar in various angular positions with respect to said frame member.

16. In a mining machine of the class described, a truck mounted on track wheels and axles for movement along a mine track, a cutting element supported on said truck for reciprocable slidable movement with respect thereto comprising a motor, a vertically disposed cutter chain carrying cutter bar mounted for pivotal movement about a horizontal axis adjacent its rearward end, a single frictionally controlled plural speed gear reduction means driven by said motor and having operative connection with said cutter bar and cutting element for moving said cutter bar about said pivotal axis and independently reciprocably moving said cutting element with respect to said truck, and self-locking means for holding said cutter bar in various angular positions with respect to said truck.

17. In a mining machine of the class described, a track-mounted truck, a cutting element supported on said truck for reciprocable slidable movement with respect thereto comprising a motor, a cutter bar disposed forwardly thereof and pivotally movable in a vertical plane, selflocking mechanism driven by said motor for vertically swinging said cutter bar, and mechanism for feeding said cutter bar with respect to said truck comprising a rack on said truck, a pinion meshing therewith and a frictionally controlled plural speed geared reduction drive driven by said motor and having driving connection with said pinion.

18. In a mining machine of the class described, a track-mounted truck, a cutting element supported on said truck for reciprocable movement with respect thereto comprising a motor, a cutter bar disposed forwardly thereof and pivotally movable with respect thereto in a vertical plane, self-locking mechanism driven by said motor for swinging said cutter bar, and mechanism for feeding said cutter bar with respect to said truck comprising a rack on said truck, a pinion meshing therewith and plural speed means for reciprocably moving said cutting element with respect to said truck comprising a plural speed planetary geared reduction device driven by said motor and having selective connection with said pinion.

19. In a mining machine of the class described, a track-mounted truck, a cutting element supported on said truck for reciprocable movement with respect thereto comprising a motor, a cutter bar disposed forwardly thereof and pivotally movable with respect thereto in a vertical plane, self-locking mechanism driven by said motor for swinging said cutter bar, and mechanism for feeding said cutter bar with respect to said truck comprising a rack on said truck, a pinion meshing therewith and frictionally controlled plural speed means for reciprocably moving said cutting element with respect to said truck comprising a frictionally controlled plural speed planetary geared reduction device driven by said motor and having selective driving connection with said pinion.

20. In a mining machine, a track-mounted truck, and shearing cutting mechanism mounted on said truck including a frame rectilinearly movable along said truck, a cutter chain carrying cutter bar mounted on said frame for movement therewith and for pivotal movement about a horizontal transverse axis, a motor on said frame, and drive connections from said motor for moving said cutting mechanism along said truck, pivotally moving said cutter bar in a vertical plane and driving said cutter chain about said cutter bar comprising a shaft coaxial with the pivotal axis of said cutter bar for driving said cutter chain, a plural speed gear reduction mechanism coaxial with a shaft perpendicular to said last-mentioned shaft and extending in parallel relation with said cutter bar, a drive connection from said rst-mentioned shaft to said gear reduction mechanism, a selective drive connection from said gear reduction device to said last-mentioned shaft, a drive connection from one end of said last-mentioned shaft for rectilinearly moving said cutting mechanism and a drive connection from the opposite end of said shaft for pivotally moving said cutter bar at a feeding speed.

21. In a mining machine, a track-mounted truck, and shearing cutting mechanism mounted on said truck including a rectilinearly movable frame, a cutter chain carrying cutter bar mounted on said frame for movement therewith and for pivotal movement about a horizontal transverse axis, a motor on said frame, and drive connections from said motor for moving said cutting mechanism along said truck, pivotally moving said cutter bar in a vertical plane and driving said cutter chain about said cutter bar comprising a shaft coaxial with the pivotal axis of said cutter bar for driving said cutter chain, a shaft perpendicular to said shaft and a frictionally controlled planetary geared reduction device coaxial with said last-mentioned perpendicular shaft, a drive connection from said rst-mentioned shaft to said planetary, a selective drive connection from said planetary to said last-mentioned perpendicular shaft, a drive connection from one end of said last-mentioned perpendicular shaft for rectilinearly moving said cutting mechanism, and a drive connection from the other end of said perpendicular shaft for pivotally moving said cutter bar at a feeding speed.

FRANK LIND GREN. 

